The 2nd sled is on the same incline as the 1st sled so it has the same acceleration. You probably figured out the acceleration of the 1st sled to answer #5. The 2nd sled is accelerating down the slope.
You probably also figured out the time it took the 1st sled to slide up the incline. It will take the same amount of time to slide down the incline, and that is the amount of time the 2nd sled has to slide down the incline.
The problem gives you the length of the slope. If you pick "down the incline" as your positive direction then the initial displacement is 0, and all other numbers (final displacement, initial velocity, acceleration) are positive. This is a kinematics equation and you should have enough information to solve for the initial velocity.
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The 2nd sled is on the same incline as the 1st sled so it has the same acceleration. You probably figured out the acceleration of the 1st sled to answer #5. The 2nd sled is accelerating down the slope.
You probably also figured out the time it took the 1st sled to slide up the incline. It will take the same amount of time to slide down the incline, and that is the amount of time the 2nd sled has to slide down the incline.
The problem gives you the length of the slope. If you pick "down the incline" as your positive direction then the initial displacement is 0, and all other numbers (final displacement, initial velocity, acceleration) are positive. This is a kinematics equation and you should have enough information to solve for the initial velocity.
Good luck.
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